Results 161 to 170 of about 2,355 (221)
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Paleobiology, 1983
In earlier and simpler times in North American geology, there was an extraordinarily large amount of unexplored ground per available geologist to study it. State and territorial geological surveys, which undertook the first comprehensive mapping programs in the nineteenth century, were at first able to make only the grossest descriptions of outcrops in
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In earlier and simpler times in North American geology, there was an extraordinarily large amount of unexplored ground per available geologist to study it. State and territorial geological surveys, which undertook the first comprehensive mapping programs in the nineteenth century, were at first able to make only the grossest descriptions of outcrops in
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Geophysical characterization of black shales
Proceedings, 2012Black shales are dark, thinly bedded sedimentary rocks deposited under anaerobic conditions. They are rich in carbon, sulfides and organic matter, and potentially can serve as hydrocarbon source rocks. Black shales may also contain significant enrichments of gas or oil (gas shales, oil shales).
Bauer, K. ; https://orcid.org/0000-0002-7777-2653 +7 more
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Elemental profile of black shales
Chinese Journal of Geochemistry, 2011A black shale sample collected from the Chimiari site (Tarbela) was analyzed for elemental contents. Inductively coupled plasma-optical emission spectrometry (ICP-OES) was employed to determine major and trace elements in the digests. Precise analysis was accomplished for the black shales, which was better than 2.0%.
Kashif Naeem +3 more
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Black shales in Ukraine – A review
Marine and Petroleum Geology, 2012Abstract As a result of a long-lasting and complex geological history, organic-matter-rich fine-grained rocks (black shales) with widely varying ages can be found on Ukrainian territory. Several of them are proven hydrocarbon source rocks and may hold a significant shale gas potential. Thick Silurian black shales accumulated along the western margin
Reinhard F. Sachsenhofer +1 more
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Annals of the New York Academy of Sciences, 1961
Studies on uranium-lead dating of black shales on the Upper Devonian Chattanooga shale and the Upper Cambrian Swedish alum shale are presented. From these studies the ages are estimated to be 320 to 350 m.y. for the Chattanooga shale and 500 m.y. for the Swedish alum shale. The principal problems of U-Pb dating and its possibilities are discussed.
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Studies on uranium-lead dating of black shales on the Upper Devonian Chattanooga shale and the Upper Cambrian Swedish alum shale are presented. From these studies the ages are estimated to be 320 to 350 m.y. for the Chattanooga shale and 500 m.y. for the Swedish alum shale. The principal problems of U-Pb dating and its possibilities are discussed.
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Oxidation and Heave of Black Shale
Journal of the Soil Mechanics and Foundations Division, 1973EVIDENCE IS PRESENTED IN SUPPORT OF THE THEORY THAT AUTOTROPHIC BACTERIA OF THE THIOBACILLUS-FERROBACILLUS FERROOXIDANS SPECIES ARE IMPORTANT IN CATALYZING THE OXIDATION OF SULPHIDES IN BLACK SHALE. GYPSUM IS SUGGESTED AS THE ACTUAL MINERAL SPECIES CAUSING AT LEAST SOME OF THE HEAVE.
Robert M. Quigley +3 more
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2000
Black shales, in general, form under low oxic to anoxic conditions, where microbes have evolved a variety of metabolic pathways. Modern oxygen-depleted environments typically contain anaerobic heterotrophic bacteria, aerobic chemolithoautotrophic bacteria (which partly live in mutualistic relationship with certain metazoa) and anaerobic ...
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Black shales, in general, form under low oxic to anoxic conditions, where microbes have evolved a variety of metabolic pathways. Modern oxygen-depleted environments typically contain anaerobic heterotrophic bacteria, aerobic chemolithoautotrophic bacteria (which partly live in mutualistic relationship with certain metazoa) and anaerobic ...
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Molybdenum in black shales and the incidence of bovine hypocuprosis
Journal of the Science of Food and Agriculture, 1972AbstractStream sediments were sampled systematically in nine areas totalling 1100 sq. milesThroughout this paper 1 sq. mile = 2.589 km2. underlain in part by marine black shales ranging in age from Ordovician to Cretaceous. Regional patterns of molybdenum in the sediment were related to the underlying bedrock.
I, Thomson, I, Thornton, J S, Webb
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Black Shale as a Sorbent for Trichloroethylene and CR(VI)
Environmental Technology, 2005Black shale was examined as a natural sorbent for organic and inorganic contaminants. Trichloroethylene (TCE) could be removed well from the water by sorption onto the locally available black shale because of the high organic carbon content (5.2%) of the black shale in this study.
J E, Min, T, Lee, J, Choi, J W, Park
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1993
Shales that are rich in organic matter occur throughout the geologic record, but special conditions are responsible for their occurrence (Tourtelot, 1979). Before considering organic matter- and metal-rich shales, some background information is necessary.
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Shales that are rich in organic matter occur throughout the geologic record, but special conditions are responsible for their occurrence (Tourtelot, 1979). Before considering organic matter- and metal-rich shales, some background information is necessary.
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